This two-output circuit was found in General Electric documentation from the 1990s. The circuit uses an NTC as a sensor and the control element is an SCR.
This circuit can be used to recognize a tone by its frequency. When this tone is present in a...
Found in a 1980s documentation, this amplifier uses an operational aplifier of the time with two...
This circuit, from a publication of the 1970s, can compare the intensity of two light sources,...